# Relationship history for MSHA mine 4406396

Current hierarchy: **Gott Jim → H & G Enterprises Inc → Dickenson Dock**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Classic Energy Inc → Dickenson Dock; 1987-08-01 to 1993-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Grigsby → Dickenson Dock; 1987-08-01 to 1993-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Grigsby → Classic Energy Inc; 1987-08-01 to 1993-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Valley Coal Services Inc → Dickenson Dock; 1993-02-10 to 1995-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Southeastern Coal Services Inc → Dickenson Dock; 1993-02-10 to 1995-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Southeastern Coal Services Inc → Valley Coal Services Inc; 1993-02-10 to 1995-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Gott Jim → Dickenson Dock; 1993-04-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & G Enterprises Inc → Dickenson Dock; 1995-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gott Jim → H & G Enterprises Inc; 1995-08-04 to current/open; source msha-controller-operator-history